如何使用Spring云Netflix Feign设置自定义Jackson ObjectMapper

Question

我遇到了一个需要为第三方API定义一次性@FeignClient的场景。在这个客户端中，我想使用与我的@Primary不同的自定义Jackson ObjectMapper。我知道可以重写Spring的假装配置默认值，但是我不清楚如何仅仅通过这个特定的客户端来覆盖ObjectMapper。

Answer 1

根据documentation，您可以为您的Feign客户端提供自定义解码器，如下所示。

假死客户端接口：

@FeignClient(value = "foo", configuration = FooClientConfig.class) 
public interface FooClient{ 
    //Your mappings 
} 

假死客户定制配置：

@Configuration 
public class FooClientConfig { 

    @Bean 
    public Decoder feignDecoder() { 
     HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper()); 
     ObjectFactory<HttpMessageConverters> objectFactory =() -> new HttpMessageConverters(jacksonConverter); 
     return new ResponseEntityDecoder(new SpringDecoder(objectFactory)); 
    } 

    public ObjectMapper customObjectMapper(){ 
     ObjectMapper objectMapper = new ObjectMapper(); 
     //Customize as much as you want 
     return objectMapper; 
    } 
}